155230531 has 2 divisors, whose sum is σ = 155230532. Its totient is φ = 155230530.

The previous prime is 155230529. The next prime is 155230541. The reversal of 155230531 is 135032551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155230531 - 2¹ = 155230529 is a prime.

It is a super-2 number, since 2×155230531² = 48193035509083922, which contains 22 as substring.

Together with 155230529, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 155230496 and 155230505.

It is not a weakly prime, because it can be changed into another prime (155230511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77615265 + 77615266.

It is an arithmetic number, because the mean of its divisors is an integer number (77615266).

Almost surely, 2^155230531 is an apocalyptic number.

155230531 is a deficient number, since it is larger than the sum of its proper divisors (1).

155230531 is an equidigital number, since it uses as much as digits as its factorization.

155230531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2250, while the sum is 25.

The square root of 155230531 is about 12459.1545058242. The cubic root of 155230531 is about 537.4347132530.

The spelling of 155230531 in words is "one hundred fifty-five million, two hundred thirty thousand, five hundred thirty-one".